Refrigerants for screw compressors

Bitzer’s R1234yf and R1234ze(E) HFO refrigerants for its CSH and CSW screw compressors are two alternatives to R134a. Both of the HFOs are suitable for air conditioning, medium temperature applications, and heat pumps. R1234ze(E) is listed as nonflammable up to 140°F. These tried-and-tested products can be operated with the standard ester oil charge (Y-model) with HFO refrigerants in the documented applications. CSH compressors can be used in air cooled liquid chillers for comfort air conditioning and in heat pumps. The CSW series is suitable for use in liquid chillers operated at low condensing temperatures.